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  <title>Read a CLOB from the database</title>

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</div><hr /><div id="function.fbsql-read-clob" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">fbsql_read_clob</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">fbsql_read_clob</span> &mdash; <span class="dc-title">Read a CLOB from the database</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.fbsql-read-clob-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">string</span> <span class="methodname"><strong>fbsql_read_clob</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$clob_handle</code></span>
   [, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link_identifier</code></span>
  ] )</div>

  <p class="para rdfs-comment">
   Reads CLOB data from the database.
  </p>
  <p class="para">
   If a select statement contains BLOB and/or CLOB columns FrontBase will
   return the data directly when data is fetched. This default behavior can
   be changed with <span class="function"><a href="function.fbsql-set-lob-mode.html" class="function">fbsql_set_lob_mode()</a></span> so the fetch
   functions will return handles to BLOB and CLOB data.  If a handle is
   fetched a user must call <span class="function"><strong>fbsql_read_clob()</strong></span> to get the
   actual CLOB data from the database.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.fbsql-read-clob-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">clob_handle</code></em></dt>

     <dd>

      <p class="para">
       A CLOB handle, returned by <span class="function"><a href="function.fbsql-create-clob.html" class="function">fbsql_create_clob()</a></span>.
      </p>
     </dd>

    
    <dt>
<em><code class="parameter">
link_identifier</code></em></dt>
<dd>
<p class="para">由
<span class="function"><a href="function.fbsql-connect.html" class="function">fbsql_connect()</a></span> 或
<span class="function"><a href="function.fbsql-pconnect.html" class="function">fbsql_pconnect()</a></span> 返回的 FrontBase 链接标识符.</p>
<p class="para">如可选并未指定，函数会尝试查找一个到 FrontBase 服务器的开放链接，且如没有找到这样的链接，会尝试通过不带参数调用 <span class="function"><a href="function.fbsql-connect.html" class="function">fbsql_connect()</a></span> 来创建一个。</p>
</dd>

   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.fbsql-read-clob-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns a string containing the specified CLOB data.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.fbsql-read-clob-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-1110">
    <p><strong>Example #1 <span class="function"><strong>fbsql_read_clob()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$link&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fbsql_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"_SYSTEM"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"secret"</span><span style="color: #007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;or&nbsp;die(</span><span style="color: #DD0000">"Could&nbsp;not&nbsp;connect"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$sql&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;CLOB_COLUMN&nbsp;FROM&nbsp;CLOB_TABLE;"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$rs&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fbsql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$sql</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$row_data&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fbsql_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//&nbsp;$row_data[0]&nbsp;will&nbsp;now&nbsp;contain&nbsp;the&nbsp;clob&nbsp;data&nbsp;for&nbsp;the&nbsp;first&nbsp;row<br /></span><span style="color: #0000BB">fbsql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$rs&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fbsql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$sql</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fbsql_set_lob_mode</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FBSQL_LOB_HANDLE</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$row_data&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fbsql_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//&nbsp;$row_data[0]&nbsp;will&nbsp;now&nbsp;contain&nbsp;a&nbsp;handle&nbsp;to&nbsp;the&nbsp;CLOB&nbsp;data&nbsp;in&nbsp;the&nbsp;first&nbsp;row<br /></span><span style="color: #0000BB">$clob_data&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fbsql_read_clob</span><span style="color: #007700">(</span><span style="color: #0000BB">$row_data</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">fbsql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.fbsql-read-clob-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.fbsql-create-clob.html" class="function" rel="rdfs-seeAlso">fbsql_create_clob()</a> - Create a CLOB</span></li>
    <li class="member"><span class="function"><a href="function.fbsql-read-blob.html" class="function" rel="rdfs-seeAlso">fbsql_read_blob()</a> - Read a BLOB from the database</span></li>
    <li class="member"><span class="function"><a href="function.fbsql-set-lob-mode.html" class="function" rel="rdfs-seeAlso">fbsql_set_lob_mode()</a> - Set the LOB retrieve mode for a FrontBase result set</span></li>
   </ul>
  </p>
 </div>


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